Xenogenesis: Basic Length Breakdown

## Warning: replacing previous import 'lifecycle::last_warnings' by
## 'rlang::last_warnings' when loading 'tibble'

## Warning: replacing previous import 'lifecycle::last_warnings' by
## 'rlang::last_warnings' when loading 'pillar'

## `summarise()` regrouping output by 'book', 'part' (override with `.groups`
## argument)